89 results about "Green development" patented technology

The invention relates to the technical field of urban green development evaluation, and particularly discloses an urban green development level comprehensive evaluation method based on a digital technology, which comprises the following steps: constructing an urban green development level comprehensive evaluation index system and a digital technology development level comprehensive evaluation index system; urban index data are selected and preprocessed; a comprehensive evaluation model is constructed based on an entropy weight-TOPSIS method, the entropy weight method is used for determining the weight of each index, and the TOPSIS method is used for determining an evaluation index; analyzing a green development level index and a digital technology development level index of each city by using a comprehensive evaluation model; a spatial statistical analysis method, a random forest model and a VAR model are adopted to analyze a space-time effect and an interaction mechanism of digital technology development and urban green development. According to the method adopted by the invention, the limitation of traditional static evaluation is broken through, multi-dimensional coupling analysis of the digital technology and urban green development is realized, and scientific support can be provided for formulating a regional differentiation green development strategy.

The invention relates to the technical field of recycling of renewable resources, in particular to an asphalt pavement milling material cold-recycled prefabricated part and a preparation method, and the asphalt pavement milling material cold-recycled prefabricated part is prepared from the following raw materials in parts by weight: 45 to 53 parts of waste pavement milling material with the particle size of less than 4.75 mm, 19 to 27 parts of waste pavement milling material with the particle size of 4.75 to 9.5 mm, 20 to 28 parts of stone chips, 1 to 1.4 parts of mineral powder, 1.6 to 2.0 parts of silica fume, 4.6 parts of water, 2.3 to 2.7 parts of cement and 2.3 to 2.7 parts of foamed asphalt. According to the invention, the waste asphalt pavement milling material is used as the raw material of the concrete prefabricated component, so that the resource is saved, the utilization rate of the asphalt milling material is increased, and the green development concept is met; the prefabricated parts are manufactured through a cold regeneration process, compared with a traditional hot mix plant regeneration process, energy is saved, environment friendliness is achieved, emission of greenhouse gas is reduced, and therefore the problems that the hot mix plant regeneration mode is high in cost and carbon emission are solved.

The invention designs an environment-friendly blowout device suitable for a high-salinity gas well, and belongs to the technical field of unconventional petroleum and natural gas extraction. The device comprises a two-stage concentric liquid remover and a combustion purification system which are connected in sequence. The two-stage concentric liquid remover realizes efficient separation of gas, liquid and solid phases through two-stage centrifugal separation. And a self-adaptive liquid discharge and gas control mechanism is arranged at the bottom of the two-stage concentric liquid remover, so that flow fluctuation self-adaptive sealing can be realized. Pretreated gas enters a combustion tank, is discharged through a torch pipe and is ignited, and generated combustion gas and solid particles are sprayed and purified in all directions and sprayed liquid is recycled through a spraying and recycling device above the combustion gas and the solid particles. The device integrates multiple technical functions such as buffering and pressure stabilizing, multi-phase separation, all-directional spraying purification, fire-liquid isolation, flow fluctuation self-adaption, automatic sealing, explosion prevention and fire retardance, the three-phase separation efficiency is remarkably improved, salting-out particles entering the environment are reduced, and equipment and technical supports are provided for green development of a hypersalinity gas well.

The invention relates to the technical field of oil and gas field environment monitoring, and particularly discloses a digital intelligent risk assessment method, platform and equipment for an oil and gas field environment. The method comprises the following steps: acquiring environmental monitoring data of an oil and gas field, the environmental monitoring data comprising pollutant concentration data and meteorological data; the environment monitoring data is preprocessed; constructing an environmental protection regulation knowledge graph; matching the preprocessed environmental monitoring data with the environmental protection regulation knowledge graph to generate a matching result; evaluating the environmental risk level of the oil and gas field according to the matching result; and outputting an environmental risk assessment result according to the environmental risk level. According to the method, through data preprocessing and knowledge graph matching, automatic compliance assessment and risk quantification of environmental indexes are realized, the timeliness and accuracy of risk identification are improved, preventive intervention is supported, and the method is suitable for green development and management of oil and gas fields.

The invention discloses an industrial park carbon emission metering method based on a carbon emission flow theory and green electricity auxiliary service. The method comprises the following steps: S100, constructing an industrial park carbon emission metering model; s200, confirming and issuing a carbon emission factor; s300, data acquisition is carried out; s400, direct carbon emission metering, indirect carbon emission metering and green electricity auxiliary service carbon emission influence metering are carried out according to the issued carbon emission factors and data obtained through data acquisition; according to the method, the influence of direct carbon emission, indirect carbon emission and green electricity auxiliary service on carbon emission in the industrial park is comprehensively considered, and compared with a traditional metering method, the real carbon emission condition of the industrial park can be reflected more comprehensively and accurately. By accurately metering the carbon emission, the industrial park is helped to formulate a more scientific and reasonable energy conservation and emission reduction strategy, the energy utilization efficiency is improved, and green development is promoted.

The application provides a watershed shoreline sustainable development dynamic evaluation method, comprising the following steps: constructing a water environment carrying capacity and shoreline green development index judgment matrix; dynamically analyzing a weight vector through a neural network; synthesizing a carrying capacity index and a green development index based on the weight; dynamically correlating the two indexes by establishing a coupling function; and outputting a sustainable development index. Four major capabilities are broken through and jumped: a spatial correction matrix breaks through administrative barriers and enhances cross-border consistency; a multi-task neural network self-adapts weight adjustment in dry seasons; an entropy value gate fusion suppresses index noise; a pulse neural network coupling function avoids critical point distortion; and a digital twin body constructs an evolutionary benchmark. The method forms a "spatial coupling-dynamic weighting-intelligent synthesis-collaborative correlation-twin evolution" full-chain innovation, solves the problems of evaluation fragmentation, rule rigidity, index imbalance and management disconnection, and promotes the watershed management to adapt to the collaborative paradigm.

The invention provides underground carbon dioxide pre-fracturing sand injection permeability increasing and CCUS equipment and method, and belongs to the technical field of energy and mineral engineering, and the equipment comprises a high-pressure pump injection system, a high-pressure sand injection system, an array type sound wave monitoring system, a gas liquefaction separation system and a main monitoring system; the high-pressure pumping system comprises a fluid high-pressure storage system and a pumping monitoring system; the method comprises the steps that all the devices are connected after drilling, the monitoring system controls pumping of high-pressure water or high-pressure acid gas fluid or solid-liquid-gas multi-phase fluid, array type sound waves are combined to monitor and regulate the rock stratum fracture form, CO2 is recycled after fracturing, and the carbon sequestration amount, the capture amount and the utilization rate are analyzed. According to the device and the method, integration of fracturing anti-reflection and carbon capture, utilization and sealing is achieved, the operation efficiency and the safety are improved, and the device and the method can be popularized to the ground to assist double-carbon target achievement and deep resource green development in the energy field.

This invention discloses a method and system for quantitatively assessing carbon emissions during transformer operation, belonging to the technical field of equipment carbon emission assessment. The method includes: determining the sources of carbon emissions from the transformer, including direct and indirect carbon emissions; for indirect carbon emissions, determining the transformer's power loss value within a specified time period, and determining the carbon dioxide equivalent of the power loss based on the power carbon dioxide emission factor; for direct carbon emissions, determining the transformer's fault gas generation within the specified time period, and determining the carbon dioxide equivalent of the fault gas generation based on the global warming potential; and quantifying the carbon emissions during the transformer operation phase within the specified time period based on the power loss and the carbon dioxide equivalent of the fault gas generation. This invention can accurately quantify the direct and indirect carbon emissions of transformers during operation, and can promote the low-carbon transformation and green development of the power industry.

This invention discloses a method for assessing urban land green efficiency based on cross-regional technology flow maps. The method acquires the technology input factors, technology output factors, and land input factors of the target city and its related cities through data collection and processing rules, forming a basic data set. Based on cross-regional technology association determination rules, it identifies the correspondence between different cities in terms of technology transfer, technology output, and technology absorption, generating a cross-regional technology flow map. Based on this map, it constructs a set of land green efficiency influencing factors. By introducing the impact of cross-regional technology flow into the correspondence between land input and output, it achieves a comprehensive assessment of the target city's land green efficiency. This invention can reflect the impact of cross-regional technology flow on urban land green utilization efficiency, improves the objectivity and comparability of assessment results, and is applicable to urban green development assessment and land resource management decision-making scenarios.

The invention relates to a mix proportion design method and application of machine-made sand concrete doped with a dry cleaning and slurry wrapping medium, and aims to solve the technical problem of efficient resource utilization of the dry cleaning and slurry wrapping medium of a concrete mixing truck. By means of the machine-made sand concrete mix proportion design method, the slurry wrapping medium generated by dry cleaning of a concrete mixing truck can be completely utilized in a resource mode, the concrete mix proportion design efficiency is improved, the test period is shortened, the cement consumption is reduced, and the economic cost is reduced; the environment pollution caused by waste water and waste slurry generated by washing the concrete mixing transport vehicle is avoided, the development of the dry cleaning technology of the concrete mixing transport vehicle can be promoted, no waste is generated in cleaning of the concrete mixing transport vehicle, and the clean and sustainable green development of the premixed concrete industry is promoted.

The invention relates to the field of supply chain screening, in particular to an enterprise transportation supplier evaluation method and device fusing carbon emission factors. According to the method, influences of multiple factors such as the carbon emission condition, the cargo transportation volume, the expenditure amount and the mileage of a transportation supplier in two statistical periods are comprehensively considered, the performance conditions of the supplier in multiple dimensions such as the carbon emission, the transportation efficiency and the expenditure amount are comprehensively evaluated, and optimal management of an enterprise transportation supply chain is achieved; meanwhile, the carbon emission efficiency is incorporated into an evaluation system for screening suppliers, the trend of green development is met, and the comprehensive management requirement of an enterprise for a green supply chain is met.

The application discloses a kind of power grid operation power distribution optimization methods for monitoring multidimensional data, utilize the sensor network distributed in each key node of power distribution network to realize multidimensional data acquisition, the multidimensional data collected are received and cleaning operation is realized, based on the multidimensional fusion of load change prediction result, power supply resource use priority and power supply consumption value generates power distribution optimization strategy, and the application relates to power distribution management technical field.The power grid operation power distribution optimization method for monitoring multidimensional data, by constructing the double threshold prediction rule of "change rate threshold and load total amount threshold", the abnormal change rate weight threshold and average load threshold are calculated by historical load data, can predict load change trend and abnormal situation in advance, avoid overload or power supply shortage caused power grid failure, improve power grid operation stability, and fully tap clean power supply resources in the region, realize the collaborative scheduling of clean resources and traditional power grid power supply, meet the energy green development trend.

The invention discloses a green low-carbon treatment device for landfill leachate. The method belongs to the field of landfill leachate treatment. The problems of durability, biological accumulation and toxicity caused by the existing landfill leachate are solved. The device comprises a landfill leachate collecting tank, a three-dimensional electrolysis pretreatment tank, a sulfur circulation multi-stage anaerobic biological treatment tank, a sedimentation tank, an ozone catalysis device and a tail end biological enhancement filter tank which are connected in sequence. According to the invention, the removal of ammonia nitrogen, total phosphorus and refractory organic matters and the reduction of sludge in the biological treatment section are realized, and the effluent is ensured to reach the discharge standard in Pollution Control Standard for Household Refuse Landfill (GB 16889-2008). According to the invention, full quantification and low carbonization of landfill leachate treatment are realized, and the treatment cost is greatly reduced. According to the present invention, the environmental pollution problem can be easily solved, the water resource and the ecological environment can be protected, the technical progress and the industrial upgrading of the water treatment industry can be promoted, and the implementation of the green development and the sustainable development strategy can be promoted.

The embodiment of the invention discloses an urban agglomeration green development path identification method under a complex situation. The method comprises the following steps: S1, constructing an urban agglomeration green development evaluation model; s2, evaluating a coordination relationship between urban agglomeration green development and natural resource consumption through an urban agglomeration green development evaluation model; s3, constructing a hybrid prediction model; s4, predicting the green development index data of the urban agglomeration in the future year according to situations through the hybrid prediction model; and S5, based on an evaluation result of the urban agglomeration green development evaluation model and a prediction result of the hybrid prediction model, identifying an urban agglomeration green development path under multiple future situations. By constructing the urban agglomeration green development evaluation model, scientific measurement of the green development level, refined identification of resource consumption characteristics and quantitative analysis of the coordination relationship between the two are realized, a scientific basis is provided for making differentiated green development policies for urban agglomeration, and the method has a wide application prospect. And the urban agglomeration is promoted to be converted from a high-consumption development mode to a green sustainable development mode.

The utility model relates to rainwater recycling technical field discloses a kind of community rainwater recycling storage devices, including the water storage tank being set in open shape and the annular frame plate being connected in the top end of water storage tank and drain pipe, the drain pipe inside fixedly connected with the baffle being set in L shape, upper inlet pipe and middle inlet pipe are respectively embedded between the water storage tank and drain pipe, the annular frame plate inner end is fixedly connected with frame, the frame inner top is clamped with foam board, a plurality of conical cultivation holes are perforated in the foam board, the frame bottom end is all provided with through-hole, the diameter of which is less than the inner diameter of frame, the water storage tank inner wall is fixedly connected with detachable filter screen close to the through-hole lower end, the upper inlet pipe, middle inlet pipe input end is all located in the included angle side in baffle, the utility model solves the problem that traditional device function is single, utilization is low, adapts community green development demand.

The invention discloses a baking-free brick prepared from high-content granite tail mud and a preparation method, the preparation method comprises the following steps: S1, adding 50-70% of granite scrubbing tail mud, 15-25% of pretreated phosphogypsum and 10-20% of a composite curing agent into a stirrer, and mechanically stirring uniformly to prepare a premix; s2, directly adding the premix treated in the step S1 into a mold, vibrating on a vibrating table for 5 minutes, and scraping by using a knife; and S3, putting the mold filled with the mixed material into a plastic film, sealing and storing, and naturally curing a green brick at the room temperature of 20-35 DEG C to obtain the baking-free brick. According to the baking-free brick, the granite scrubbing tail mud and the phosphogypsum are utilized, clay resources are saved, environmental pollution and land occupation caused by tail mud and phosphogypsum storage yards are reduced, meanwhile, the tail mud and the phosphogypsum are subjected to resource utilization, and the national sustainable green development requirement is met.

The embodiment of the invention discloses a transformation method for transforming an existing shield working well, which comprises the following steps: evaluating the shield working well, and determining transformation conditions met by the shield working well, the transformation conditions comprising a first transformation condition, a second transformation condition and a third transformation condition; under the condition that the shield working well meets the first transformation condition, the shield working well is transformed into an underground mechanical garage; under the condition that the shield working well meets the second transformation condition, the shield working well is transformed into an underground recreation and sports activity space; and under the condition that the shield working well meets the third transformation condition, the shield working well is transformed into the deep diving base. The shield working well is transformed through the method, so that the shield working well can be reutilized, the policy orientation of layered development of underground space is responded, the green development concept of resource saving and cyclic utilization is met, and secondary resource consumption caused by repeated construction of similar underground space is avoided.

The utility model discloses leaching and solidifying combined soil remediation equipment which comprises a box body, a smashing assembly and a classified storage assembly are arranged on the top side of the box body, connecting plates are fixedly installed on the inner walls of the two sides of the box body, a same tank body is fixedly connected between the two connecting plates, a mixing assembly is arranged in the tank body, and the mixing assembly is fixedly connected with the box body. Polluted soil is subjected to crushing pretreatment through the crushing assembly, the contact area of the soil and an eluting agent is greatly increased, the eluting effect is improved, pollutants can be separated more efficiently, cyclic utilization of the eluting agent is achieved through the circulating assembly, consumption of water resources and chemical reagents is reduced, the potential pollution risk to the environment is reduced, and meanwhile, the recycling efficiency is improved. The filter plate and the cleaning mechanism ensure the purity of the circulating eluting agent, the stable operation of the equipment is maintained, in addition, few wastes are generated in the operation process of the equipment, the environmental protection concept of sustainable development is met, and the green development of the soil remediation industry is promoted.

The utility model relates to a permanent magnetic ferrite kiln bee groove cooling device, which comprises a main air pipe, a bee groove pipe, a filter box and a fan, moisture discharge pipes are uniformly arranged in the bee groove pipe, and a cooling water circulation system which extends into the bee groove pipe and has a flow direction opposite to that of internal gas is arranged outside the bee groove pipe. The cooling device is used for the permanent magnetic ferrite wet pressing forming kiln, the bee groove structure can effectively achieve the effect that water vapor discharged by the kiln is rapidly cooled through circulating cooling water and enters the first-stage activated carbon box body and the second-stage activated carbon box body to be filtered, all moisture discharging gas of the kiln is cooled and filtered, and the environment-friendly and safe gas discharging requirements are met; organic matters in the water vapor are reduced through the filter box, and the water vapor is conveyed to the outside of a plant to be discharged into the atmosphere, so that pollution to the atmospheric environment is reduced, green production is realized, and the requirement of future green development of the whole permanent magnetic ferrite wet-pressing magnetic shoe manufacturing is met.

This invention discloses a zoning method and system for realizing the value of natural resource ecological products, belonging to the technical field of natural resource ecological product value realization. The method first uses a zoning model to iteratively rank the ecological function priorities at the landscape scale of the study area, generating a nested landscape sequence. The model output is analyzed to identify potentially important ecological spaces and high- and low-priority areas. Then, the STARS algorithm is used to determine the grading thresholds for important ecological spaces through mutation testing and to classify them. Next, the SOFM algorithm is used to cluster the supply and demand variables of ecological products to identify clusters of supply and demand relationship characteristics. Finally, based on the identification results of these clusters, functionally similar and spatially adjacent clusters are merged, and the identification results of important ecological spaces are superimposed to obtain the ecological product value realization zoning, and zoning realization strategies and paths are proposed. This method realizes the optimal allocation and protection of ecological resources, the precise formulation of management strategies, and the coordinated green development of the region.

The application provides a carbon dioxide capturing system applied to a thermal power generating unit, comprising a membrane separation unit, a carbonation reaction unit, a cyclone separator, a carbon dioxide releasing unit, a first pipeline and a heat exchanger; the membrane separation unit is provided with an inlet, a first outlet and a second outlet, the inlet of the membrane separation unit is connected with a flue gas pipeline, and the first outlet of the membrane separation unit is connected with the inlet of the carbonation reaction unit; the outlet of the carbonation reaction unit is connected with the inlet of the cyclone separator; the first outlet of the cyclone separator is connected with the inlet of the carbon dioxide releasing unit; and the second outlet of the cyclone separator is connected with the heat exchanger through the first pipeline. One technical effect of the application is that not only the economy and effectiveness of carbon capturing can be improved, but also the comprehensive utilization efficiency of energy can be improved, so that technical support is provided for realizing a sustainable green development goal.

The dumper dust falling material receiving groove comprises the material receiving groove body and the dust falling assembly arranged on the material receiving groove body, the material receiving groove body is used for storing solid waste discharged by a dumper, the dust falling assembly can fall dust generated in the discharging process in an atomized water spraying mode, the content of dust floating in air is reduced, and the dust falling efficiency is improved. According to the dumper dust falling material receiving groove, the dust falling material receiving groove is simple in structure, environment pollution is effectively avoided, the green development concept is met, floating dust can be reduced when a dumper is unloaded, the problem of environment pollution is avoided, and the green development concept is met.

The invention discloses an all-solid waste-based water treatment material as well as a preparation method and application thereof. The all-solid waste-based water treatment material is prepared from the following raw materials in percentage by mass: 20-25% of scrap iron; 30-40% of steel slag; 15-20% of non-hazardous waste activated carbon; 15-20% of engineering slurry dry powder; 5-8% of waste glass; 5-10% of waste wood fiber; according to the invention, by adopting the raw materials with a specific ratio, various solid wastes which originally need to be paid for treatment are converted into high-performance water treatment functional materials, so that'waste is used for treating waste 'is realized, the high-cost mode that the traditional water treatment materials depend on commodity raw materials is fundamentally overturned, and various phosphorus removal principles such as porous adsorption, iron-carbon micro-electrolysis and biological membranes are integrated; and the material is an efficient, long-acting, stable and environment-friendly all-solid wastewater treatment material, and has important significance in promoting green development of the water treatment industry and reducing the treatment cost.

The utility model relates to the technical field of water-based paint recovery, and discloses a water-based paint wet-process centrifugal purification and recovery device which comprises an equipment mounting frame, a recovery assembly is arranged on the equipment mounting frame, and the recovery assembly is used for recovering paint spraying mist waste gas. New pollutants are not generated in the using process of the water-based paint wet-process centrifugal purification and recovery device, secondary pollution is avoided, compared with a catalytic combustion method, the temperature condition for generating dioxin is avoided, CO2 emission after incineration is avoided, and therefore safety is high; compared with an activated carbon adsorption method, a photocatalytic oxidation method and a biological method, dangerous solid wastes needing special treatment are not generated; compared with traditional water curtain treatment, a large amount of waste water is not generated, meanwhile, the operation environment of workers and the living environment of surrounding people are improved, and the water-based paint wet-process centrifugal purification and recovery device not only reduces environmental pollution, but also promotes green development of enterprises, and has good environmental benefits and social benefits.

The invention belongs to the technical field of industrial sewage treatment, and provides a multi-water-source coupling application method for wastewater reuse, which comprises the following steps: balancing municipal sewage multi-point introduction load, blending reclaimed water with new water, online cleaning and ultrafiltration during immersion, online cleaning of a reverse osmosis membrane and online sterilization of the reverse osmosis membrane. The application of the method relieves the restriction of water resource shortage on sustainable development of companies; meanwhile, the situations of shortage of urban water resources and serious water area pollution can be relieved, co-fusion development of cities and enterprises is achieved, a new sustainable development way is developed for green development of iron and steel enterprises and comprehensive utilization of water resources, and wide popularization prospects and profound social significance are achieved.

The invention discloses a self-generating device of a tower crane, the crane and an implementation method of the self-generating device, and belongs to the technical field of tower cranes. According to the device, an independent and flexible power supply system is formed by installing a diesel generating set with adaptive power on a balance arm of the tower crane and matching with an energy storage device, a damping base and an integrated electrical control system. The integrated electrical control system can monitor voltage in real time, adjust the rotating speed of the generator, realize arc-free switching between the generator set and the energy storage device, and support selective access to an external power grid for independent or grid-connected power supply. The implementation method comprises an independent self-generating mode and a power grid cooperative power supply mode, the problems of long-distance power transmission voltage drop and line loss can be solved, idling energy waste is reduced, the system structure is simplified, dependence on a field transformer is reduced, the stability, economical efficiency and safety of tower crane operation are improved, and the intelligent and green development requirements of engineering machinery are met.

The utility model relates to a nanofiltration membrane filtering device which comprises an NF feeding tank, a feeding hole is formed in the top of the NF feeding tank, and upstream feed liquid enters the feeding hole of the NF feeding tank through a pipeline; the device further comprises a dialysis water tank, a tubular nanofiltration membrane, an NF cleaning tank, an NF light phase tank, a heavy phase tank, an acid tank and an alkali tank, a discharge port is formed in one side of the NF feeding tank, and the discharge port is connected with a feeding port in one side of the tubular nanofiltration membrane through a conveying pipe; the whole nanofiltration system is simple and compact, small in occupied area and low in energy consumption, and promotes the green development of the industry; the PLC automatic control device is adopted in the whole process, automatic operation can be achieved, labor cost is reduced, stability is good, and maintenance is convenient.

The invention discloses a method and a system suitable for producing sodium perchlorate in a high-altitude low-pressure low-oxygen environment, which can adapt to different low-pressure low-oxygen environments through three-stage ceramic membrane gradient filtration and electrolytic pressure enhanced oxygen supply without additional auxiliary equipment, and realize the purposes that the yield is greater than or equal to 85%, the product purity is greater than or equal to 99.6%, the chloride content is less than or equal to 0.12%, and the product purity is greater than or equal to 99.6%. The core defects that in the prior art, the high-altitude yield is low, impurity removal is not thorough, and adaptability is poor are effectively overcome. Salt lake potassium and lithium extraction waste tail salt is used as a main raw material, salty mud is recycled to be used as a building material, the mother liquor recycling rate is larger than or equal to 96%, no solid waste or waste water is discharged, tail gas reaches the standard, and the green development requirement is met. And the equipment investment is reduced by 13-15%, the annual maintenance cost is reduced by 29-36%, the energy consumption per ton of products is reduced to 820-845 kWh, and the economical efficiency is outstanding. Core equipment is mature, parameters can be adjusted along with the altitude through a built-in database, high-altitude low-maintenance scenes can be adapted, large-scale production can be achieved, product indexes are superior to industrial standards, and market competitiveness is high.

The present invention provides a cold source energy field dot matrix scanning sand mold additive manufacturing method, which belongs to the field of frozen sand mold and additive manufacturing technology. This method directly lays water-containing wet sand in the forming chamber, and adopts a cold air direct writing nozzle to print the edge shape in combination with array-type low-temperature cold source dot matrix scanning to freeze the interior, and prints layer by layer to prepare the frozen sand mold. At the same time, in view of the poor fluidity of water-containing wet sand, an extrusion sand laying device is proposed to achieve quantitative laying of water-containing wet sand. This method solves the problem of insufficient penetration of water-based adhesives in the molding sand material in traditional frozen sand mold additive manufacturing technology, improves the forming accuracy and strength of sand mold products, and significantly improves the forming environment, greatly reduces resource consumption, and achieves high-precision and efficient preparation of frozen sand molds, which meets the requirements of green development of the manufacturing industry and is conducive to the transformation and upgrading of the foundry industry.

This invention discloses a double-sided display nanocrystalline film and its preparation method. The double-sided display nanocrystalline film includes: a substrate layer, a microstructure layer, and a display carrier layer; the upper surface of the microstructure layer has a fine sand structure; the lower surface of the microstructure layer is attached to the upper surface of the substrate layer; the display carrier layer includes: a front reflective layer and a back reflective layer, which are disposed opposite to each other on the fine sand structure surface, and the front and back reflective layers are discontinuous. A projector projects an image onto the surface of the double-sided display nanocrystalline film. Some light is reflected by the front reflective layer of the display carrier layer, thus displaying the image on the front side; some light is reflected by the back reflective layer, propagating the projected image through the substrate layer, thus displaying the image on the back side as well. This achieves double-sided display, effectively reducing costs and promoting green development.